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[DebugInfo] Ensure dead store elimination can mark an operand

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value as undefined

    - Correct a debug info salvage and add a test

    Reviewers: aprantl, vsk

    Differential Revision: https://reviews.llvm.org/D76930
    Bugzilla: https://bugs.llvm.org/show_bug.cgi?id=45080
This commit is contained in:
Chris Jackson 2020-03-30 14:18:01 +01:00
parent c41823bb5a
commit 2d8c535e77
2 changed files with 37 additions and 1 deletions
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2
lib/Transforms/Scalar/DeadStoreElimination.cpp
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@ -143,7 +143,7 @@ deleteDeadInstruction(Instruction *I, BasicBlock::iterator *BBI,
++NumFastOther;
// Try to preserve debug information attached to the dead instruction.
salvageDebugInfo(*DeadInst);
salvageDebugInfoOrMarkUndef(*DeadInst);
// This instruction is dead, zap it, in stages. Start by removing it from
// MemDep, which needs to know the operands and needs it to be in the

36
test/DebugInfo/X86/dead-store-elimination-marks-undef.ll Normal file
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@ -0,0 +1,36 @@
; RUN: opt -mtriple=x86_64-- -S --dse %s -o - | FileCheck %s
; Ensure that we can mark a value as undefined when performing dead
; store elimination.
; Bugzilla #45080
@b = common dso_local local_unnamed_addr global i32 0, align 1
define dso_local i32 @main() local_unnamed_addr !dbg !7 {
%1 = alloca i32, align 4
%2 = load i32, i32* @b, align 1, !dbg !13
; CHECK: call void @llvm.dbg.value(metadata i32 undef
call void @llvm.dbg.value(metadata i32 %2, metadata !12, metadata !DIExpression()), !dbg !13
store i32 %2, i32* %1, align 4, !dbg !13
ret i32 0, !dbg !13
}
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, nameTableKind: None)
!1 = !DIFile(filename: "dead-store-elimination-marks-undef.ll", directory: "/temp/bz45080")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!6 = !{!"clang version 10.0.0"}
!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !{!12}
!12 = !DILocalVariable(name: "l_2864", scope: !7, file: !1, line: 4, type: !10)
!13 = !DILocation(line: 5, column: 12, scope: !7)